Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 416,854	$ 384,579
Accounts receivable, net of allowance for doubtful accounts of $420 and $1,442, respectively	418,633	459,081
Inventories, net	320,605	324,041
Prepaid expenses and other assets	23,535	29,539
Income taxes receivable	12,034	8,062
Deferred income taxes	7,973	8,889
Total current assets	1,199,634	1,214,191
Long-term investments	10,291	10,324
Property, plant and equipment, net of accumulated depreciation of $337,447 and $330,012 respectively	173,351	176,104
Goodwill, net	37,912	37,912
Deferred income taxes	28,656	29,535
Other, net	32,933	33,411
Total assets	1,482,777	1,501,477
Current liabilities:
Current installments of capital lease obligations	517	497
Accounts payable	251,072	260,622
Income taxes payable	3,777	3,828
Accrued liabilities	52,333	65,568
Total current liabilities	307,699	330,515
Capital lease obligations, less current installments	9,971	10,103
Other long-term liabilities	20,271	19,578
Deferred income taxes	1,756	1,756
Shareholders' equity:
Preferred shares, $0.10 par value; 5,000 shares authorized, none issued
Common shares, $0.10 par value; 145,000 shares authorized; issued - 54,869 and 55,297, respectively outstanding - 54,758 and 55,186, respectively	5,476	5,519
Additional paid-in capital	648,596	651,148
Retained earnings	500,461	493,666
Accumulated other comprehensive loss	(11,181)	(10,536)
Less treasury shares, at cost; 111 shares	(272)	(272)
Total shareholders' equity	1,143,080	1,139,525
Commitments and contingencies
Total liabilities and shareholders' equity	$ 1,482,777	$ 1,501,477